Thanks everyone for the helpful comments and ideas regards, Moshe
----- Original Message ----- From: "Cortland Richmond" <[email protected]> To: <[email protected]> Sent: Wednesday, July 01, 2009 12:56 PM Subject: RE: On board flat ferrites breaking > This is where you can really use a mechanical engineer. > > If a board flexes and a ferrite does not, the resulting stress can > fracture > the ferrite. It is sometimes possible to add a board stiffener to to > prevent or modify that kind of flexing. A high frequency swept sine-wave > vibe test and a stroboscope might help identifiy board resonance and > flexure points. > > > Cortland Richmond KA5S > GE Aviation > My opinions and NOT my employer's > > > >> [Original Message] >> From: Moshe Valdman <[email protected]> >> To: [email protected] <[email protected]> >> Date: 6/29/2009 6:34:13 PM >> Subject: On board flat ferrites breaking >> >> Hi all, >> >> We have DC/DC supplies on boards which include flat ferrites mounted side > to >> side (i.e. the PC conductors go through the ferrites) >> When we test the boards for NEBS, including 10 cm drop the ferrites tend > to >> break (Interestingly during HALT or other vibrations the ferrites survuve >> well) >> >> Do you know this phenomenon? Is there some way to protect the ferrites? >> >> thanks in advance for your inputs, >> >> regards, >> Moshe > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <[email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to that > URL. > > Website: http://www.ieee-pses.org/ > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[email protected]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
